Profile radiator introduces the working principle of electronic radiator heat pipe
Working principle of heat pipe: Heat pipe is an artificial component with good heat transfer. A commonly used heat pipe consists of three parts: the main body is a closed metal pipe with a small amount of working medium and capillary structure inside. The air and other debris in the pipe must be Excluded.
There are three physical principles used in the operation of heat pipes:
(1) In a vacuum state, the boiling point of the liquid decreases;
(2) The latent heat of vaporization of the same substance is much higher than the sensible heat;
(3) The suction force of the porous capillary structure to the liquid can make the liquid flow.
A heat pipe is a passive heat transfer element with extremely high thermal conductivity. The heat pipe uses the principle of phase change and capillary action to make its heat transfer efficiency hundreds to thousands of times higher than that of pure copper of the same material. The heat pipe is a vacuum copper pipe, and the working liquid filled in it is the medium of heat transfer. In the field of electronic heat dissipation, the typical working liquid is pure water. Heat pipes made using cylindrical copper pipes are the most common. There is a liquid-absorbing core structure on the wall of the heat pipe. Relying on the capillary force generated by the wick, the condensed liquid is returned from the condensing end to the evaporating end. After the inside of the heat pipe is evacuated, the liquid is injected before the sealing, so the pressure inside the heat pipe is determined by the vapor pressure of the working liquid after evaporation. As long as the surface of the heat pipe is heated, the working liquid will evaporate. The temperature and pressure of the steam at the evaporating end are slightly higher than the rest of the heat pipe, so a pressure difference is created in the heat pipe, which forces the steam to flow to the cooler end of the heat pipe. When the steam condenses on the wall of the heat pipe, the steam releases the latent heat of vaporization, thereby transferring the heat to the condensing end. After that, the wick structure of the heat pipe makes the condensed liquid return to the evaporation end. As long as there is a heat source heating, this process will cycle.